Rotary face seal with magnetic puller loading

a magnetic puller and rotary face technology, applied in the direction of engine seals, mechanical apparatus, engine components, etc., can solve the problems of large variation in the loading of the spring mechanism, affecting the service life of the seal, and requiring customer hardware modification, so as to improve the service life and minimize variation. , the effect of improving the sealing performan

US11441685B2Active Publication Date: 2022-09-13MAGNETIC SEAL LLC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
Publication Date
2022-09-13

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Abstract

The rotary face seal with magnet loading replaces known spring mechanisms with magnetic technology that provides a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This improves seal performance and service life. The tubular magnetic ring is advantageous because it replaces existing seals within stationary cartridge with a puller type magnetic assembly design that results with the stationary cartridges being an exact exchange. The use of magnetic technology attached to the outside diameter of the rotating mating ring, which is attached to the shaft, that does not produce eddy currents because it is of a single pole configuration. The single pole magnetic assembly design is achieved by either axial or radial magnet orientation, such as in the form of a tubular magnetic band locating in a circumferential notch in the rotating mating ring.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This patent application claims priority to earlier filed U.S. Provisional Application Ser. No. 62 / 362,348, filed Jul. 14, 2016 the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] The invention relates generally to mechanical rotary face seals. Such mechanical rotary face seals are typically used to seal media (gas or fluid) between the shaft and the housing where one is stationary and the other is rotating. These seals are used in the aerospace industry, commercial industry, nuclear industry, and other high reliability industries, such as, test equipment and race car engines and transmissions or the like.

[0003] There are a number of problems and concerns typically associated with known mechanical rotary face seals. Standard mechanical rotary face seals use a spring mechanism for the mechanical load that provides positive contact against the rotary mating surface that is either a separate ring a...

Examples

Embodiment Construction

[0025]The rotary face seal of the present invention with magnet loading replaces the spring mechanism or a magnet installed in a housing with improved magnetic technology that provides a more consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This improves the seal performance and service life by eliminating the issues that compromise the effectiveness of the spring mechanism. The present invention as envisioned uses magnetic technology attached to the outside diameter of the rotary ring which is attached to the shaft. The single pole magnetic assembly design is achieved by either axial or radial magnet orientation. Thus, the tubular and single pole design of the magnet used in the present invention does not produce eddy currents due to its configuration and design.

[0026]Referring to FIGS. 4 and 5, which is a close-up view of the gap between the tubular magnet 130 and seal case 104, of the rotary face seal 1...